Adapter and method for transferring injection liquid

Abstract

The present invention provides an adapter, which is an adapter for transferring a given injection liquid to an injection device through an injection port of an injection nozzle thereof, wherein the injection device is a device for injecting a given injection liquid from the injection nozzle, and the adapter comprises a housing and a filling nozzle, wherein the housing defines a receiving portion for receiving the injection liquid, the filling nozzle is arranged in the housing in communication with the receiving portion, and when the housing is mounted on the injection device, can contact the end face of the injection device where the injection port of the injection nozzle is formed, the opening end of the filling nozzle is set to be smaller than the inner diameter of the receiving portion and larger than the injection port of the injection nozzle, and in the internal space of the housing from a part of the receiving portion to the opening end of the filling nozzle, a continuous given space at least including the part is formed in a manner that the inner diameter of the given space is reduced toward the opening end of the filling nozzle. With such a structure, the injection liquid can be appropriately transferred from the outside to the needle-free syringe.

Description

Technical Field

[0001] The present invention relates to an adapter for transferring injection liquid from the outside to a syringe side, and a method for transferring injection liquid using the adapter. Background Art

[0002] As a device for injecting a liquid medicine or the like into a target area such as a living body, a needle-free syringe can be exemplified. In recent years, needle-free syringes without an injection needle have been developed for ease of operation and hygiene. Generally speaking, in a needle-free syringe, a structure that has been put into practical use is a structure in which a liquid medicine pressurized by a driving source such as a compressed gas or a spring is injected toward a target area, and the liquid medicine is injected into the interior of the target area using the kinetic energy of the liquid medicine. Since such a needle-free syringe does not have a mechanical structure (e.g., an injection needle) that forms a flow path for the injected liquid, appropriate attention is required in the preparation stage for using the device in order to hygienically transfer the injected liquid to the needle-free syringe.

[0003] Here, Patent Document 1 discloses a structure for transferring injection liquid by connecting a needle-free syringe to a catheter using a coupling device. A needle-free syringe is installed on one side of the coupling device, and a catheter is installed on the other side. The injection liquid to be injected by the needle-free syringe is stored in the catheter. In addition, the abutment surface of the coupling device is formed to imitate the shape of the front end surface of the needle-free syringe, and the orifice of the coupling device is formed to face the orifice on the needle-free syringe side. On this basis, in order to suppress the generation of miscellaneous bacteria and the like, the abutment surface of the coupling device is formed in a manner that the injection liquid does not adhere to the front end surface of the needle-free syringe when the injection liquid is transferred from the catheter to the needle-free syringe.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: U.S. Patent Application Publication No. 2002 / 0161334 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the prior art, in order to prevent the front end face of the needleless syringe from contacting the injection liquid when transferring the injection liquid (in order to prevent bacteria and the like from growing on the front end face of the needleless syringe), the diameter of the orifice of the front end portion of the coupling device is formed to be smaller than the diameter of the orifice of the nozzle portion of the needleless syringe. Generally speaking, a needleless syringe is a device that applies high pressure to the injection liquid and uses its energy to eject the injection liquid to the target area, and therefore, for this ejection, the orifice diameter is extremely small. Therefore, in the prior art, the orifice diameter on the coupling device side is smaller than the orifice diameter on the needleless syringe side, and therefore, when the coupling device is used to transfer the injection liquid, the transfer takes a long time. In addition, when transferring a very small amount of injection liquid, it is difficult for the injection liquid to move to the front end of the orifice of the coupling device, and therefore, the air existing around it is also sucked in and transferred to the needleless syringe.

[0009] Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a technology capable of appropriately transferring injection liquid from the outside to a needle-free syringe.

[0010] Solution to the problem

[0011] In order to solve the above-mentioned problems, the present invention adopts the following structure: the opening end of the adapter is smaller than the inner diameter of the receiving portion and larger than the ejection port of the ejection nozzle of the ejection device, and a given space with a continuously decreasing diameter is arranged inside the adapter so that there is no space that causes the ejection liquid to disperse during the transfer. Based on such a structure, the ejection liquid can be transferred from the outside to the ejection device hygienically and quickly with the help of the adapter, and the inadvertent mixing of the ejection liquid and air can be suppressed during the transfer.

[0012] Specifically, the present invention is an adapter for transferring a given injection liquid to an injection device through an injection port of an injection nozzle thereof, the injection device being a device for injecting a given injection liquid from an injection nozzle, the adapter comprising a housing and a filling nozzle, the housing defining a receiving portion for receiving the given injection liquid to be transferred and being detachably configured relative to the injection device, the filling nozzle being arranged in the housing in communication with the receiving portion and being formed so as to be able to contact the end face of the injection device where the injection port is formed when the housing is mounted on the injection device so as to make the given injection liquid received in the receiving portion flow out toward the injection nozzle side, and the opening end of the filling nozzle is set to be smaller than the inner diameter of the receiving portion and larger than the injection port of the injection nozzle. Furthermore, in the internal space of the housing from a portion of the receiving portion to the opening end of the filling nozzle, a continuous given space at least including the portion is formed in such a manner that the inner diameter of the given space is reduced toward the opening end side of the filling nozzle.

[0013] The above-mentioned injection device is a device that injects injection liquid from the injection nozzle to the outside. During the injection, as a preparatory stage, the injection liquid needs to be transferred from the outside through the injection port of the injection nozzle. The adapter of the present invention is used when transferring the injection liquid to the injection device. At this time, the adapter can be installed on the injection device itself, or it can be installed on the component constituting the injection device in another way. In the present invention, for the adapter installed on the component, as long as the component constitutes a part of the injection device, it can also be understood as an adapter installed on the injection device. It should be noted that in the present application, the injection device is not limited to a specific form with respect to the injection of its injection liquid. For example, the energy used to pressurize the injection liquid transferred through the adapter for injection can also be energy generated chemically, for example, it can be combustion energy generated by oxidation reaction of gunpowder / explosive. In addition, as another method, the energy used for the pressurization can also be generated electrically, as one example, it can be the energy brought by the piezoelectric element or electromagnetic actuator driven by the input electricity. As another method, the energy used for the pressurization can also be generated physically, as one example, it can be the elastic energy of the elastic body, the internal energy of the compressed object such as compressed gas. In addition, the energy used for the pressurization can also be a composite energy formed by appropriately combining these internal energies such as combustion energy, energy brought by electricity, and elastic energy.

[0014] In addition, as the injection liquid transferred to the injection device via the adapter of the present invention, a substance containing a component that can be expected to have an effect in the object area of ​​injection and a component that can be expected to exert a given function in the object area can be exemplified. Therefore, as long as it can at least be ejected, the physical form of the injection liquid can exist in a state of being dissolved in the liquid, or it can also be a state of being not dissolved in the liquid but only mixed. As an example, as the given substance to be delivered, vaccines for enhancing antibodies, proteins for beauty, cultured cells for hair regeneration, etc. can be listed, and the injection liquid can be formed by being contained in a liquid medium in a manner that allows them to be ejected. It should be noted that as the above-mentioned medium, it is preferably a medium that does not hinder the above-mentioned effects and functions of the given substance when injected into the interior of the object area. As another method, the above-mentioned medium can be a medium that exerts the above-mentioned effects and functions by acting together with the given substance when injected into the interior of the object area.

[0015] Since the injection liquid is delivered to the target area in this way, it is necessary to pay attention to hygiene when transferring it from the receiving section defined by the housing of the adapter to the injection device. In particular, when the transfer takes a long time, the time that the injection liquid is exposed to the external environment becomes longer, which is not preferred from a hygiene point of view. When the housing of the above-mentioned adapter is installed on the injection device in order to transfer the injection liquid, a state is formed in which the injection liquid can be transferred while the filling nozzle is in contact with the end face of the injection nozzle of the injection device. Moreover, the opening end of the filling nozzle is set to be smaller than the inner diameter of the receiving section but larger than the injection port of the injection nozzle. Therefore, there is no need to reduce the diameter of the filling nozzle from which the injection liquid flows out in vain, and the transfer speed of the injection liquid can be greatly reduced, which can avoid prolonging the transfer time. In addition, during the transfer, the filling nozzle is in contact with the end face of the injection device, and the adapter can be stably positioned on the injection device, thereby achieving appropriate transfer of the injection liquid.

[0016] In addition, during the process of the injection liquid being transferred from the receiving portion to the injection device, it can move from a part of the receiving portion through the internal space of the filling nozzle toward its open end. Here, in the above-mentioned adapter, the continuous given space including at least the part of the area is formed in a manner that the inner diameter of the given space is reduced toward the open end side of the filling nozzle. According to such a structure, during the transfer, the injection liquid will not be dispersed in the filling nozzle but is easy to be concentrated, so it can be suppressed that the surrounding air is entrained during the transfer and transferred to the injection device. Thus, according to the adapter of the present application, the injection liquid can be appropriately transferred from the outside to the needleless syringe. Furthermore, it is more preferred that the above-mentioned given space is a space including the above-mentioned part of the area and the entire internal space of the above-mentioned filling nozzle. In this case, for the above-mentioned given space, it can be formed in a manner that the inner diameter of the given space from the above-mentioned part of the area to the open end of the above-mentioned filling nozzle is continuously reduced toward the open end side of the filling nozzle. According to this structure, the dispersion of the injection liquid in the filling nozzle can be more effectively suppressed, and even in the case of transferring a very small amount of injection liquid, the mixing with air can be effectively suppressed.

[0017] In addition, in the above-mentioned adapter, the above-mentioned filling nozzle may have an annular protrusion protruding from the filling nozzle to the outside thereof, and the protrusion is formed in such a way that the front end of the protrusion abuts against the end face of the injection device when the housing is installed on the above-mentioned injection device. By providing the above-mentioned adapter with such a protrusion, the annular protrusion contacts the end face of the injection device in a manner of surrounding the portion where the filling nozzle is connected to the injection nozzle. As a result, when transferring the injection liquid, the adapter can be positioned more stably on the injection device, and leakage of the injection liquid can be suppressed, thereby better achieving transfer to the injection device.

[0018] In addition, the protrusion can be formed by a flexible member. With such a structure, when the adapter is positioned on the injection device, the protrusion will deform appropriately to form an appropriate contact state between the adapter and the injection device. As a result, an appropriate seal will be generated between the adapter and the injection device, thereby suppressing leakage of the injection liquid when transferring the injection liquid, allowing more injection liquid to be transferred to the injection device. It should be noted that the flexible member forming the protrusion does not need to be limited to a specific material, and an appropriate flexible material can be selected from the perspective of a seal that is useful for the transfer of the injection liquid.

[0019] Here, in the above-mentioned adapter, the above-mentioned injection device may include a columnar nozzle portion having the above-mentioned injection nozzle inside, and the nozzle portion is formed in a manner that the injection outlet of the injection nozzle is exposed on its end face. On this basis, the above-mentioned shell may have a first cylindrical portion, and the first cylindrical portion is arranged in a manner to surround the above-mentioned filling nozzle in the shell, and is in a state of being embedded relative to the outer peripheral wall surface of the above-mentioned nozzle portion when the shell is installed on the above-mentioned injection device. By adopting such a structure, when the adapter is installed on the injection device via the shell, a positional relationship in which the first cylindrical portion and the outer peripheral wall surface of the nozzle portion are in contact and supported will be formed, thereby being able to improve the stability of its installation state.

[0020] In addition, in the adapter of the above structure, the outer peripheral wall surface of the nozzle portion forms a tapered surface inclined along the axial direction of the nozzle portion. In this case, when the housing is mounted on the device body, the inner wall surface of the first cylindrical portion can be in a state of pressing the outer peripheral wall surface of the nozzle portion and engaging with it. As a result, the contact support between the inner wall surface of the first cylindrical portion and the outer peripheral wall surface of the nozzle portion is enhanced, so that more stable mounting of the adapter can be expected.

[0021] In addition, the adapter may further include a retaining portion that retains the first cylindrical portion and the outer peripheral wall of the nozzle portion in an engaged state when the housing is mounted on the injection device. The retaining portion can retain the engaged state of the first cylindrical portion and the outer peripheral wall of the nozzle portion, thereby enabling better transfer of the injection liquid.

[0022] From the viewpoint of improving the stability of positioning the adapter and the injection device, the housing may also have a second cylindrical portion, which is arranged in a manner to surround the first cylindrical portion in the housing and is in a state of being engaged with the outer peripheral wall of the injection device when the housing is installed on the injection device. By adopting such a structure, the positioning of the adapter relative to the injection device can be achieved by means of the contact between the first cylindrical portion and the nozzle portion, and the contact between the second cylindrical portion and the injection device. As a result, the stability of the installation state of the adapter is further increased, and the transfer of the injection liquid can be performed more effectively.

[0023] In addition, the invention of the present application can also be understood from the aspect of a method for transferring an adapter containing an injection liquid in a receiving section to an injection device. That is, the method includes: preparing an adapter for transferring a given injection liquid to an injection device via an injection nozzle of the injection device, wherein the injection device is a device for ejecting the given injection liquid from the injection nozzle, wherein the adapter includes a housing and a filling nozzle, wherein the housing defines a receiving section for accommodating the given injection liquid to be transferred, and the filling nozzle is disposed in the housing in connection with the receiving section, and its opening end is set to be smaller than the inner diameter of the receiving section and larger than the injection nozzle, and the filling nozzle is disposed in a portion of the receiving section connected to the filling nozzle to the injection nozzle. In the internal space of the shell from the opening end of the nozzle to the opening end of the nozzle, a continuous given space including at least a part of the area is formed in a manner that the inner diameter of the given space is reduced toward the opening end side of the filling nozzle; the shell is installed relative to the injection device, and the front end of the filling nozzle is brought into contact with the end surface of the injection device where the injection nozzle forms the injection port; the given injection liquid is injected into the receiving portion; and when the adapter is located above the injection device in the vertical direction, the given injection liquid is removed from the receiving portion and transferred to the injection device. In addition, the technical ideas disclosed in connection with the above-mentioned adapter can also be applied to the invention of the above-mentioned method as long as no technical contradiction is generated.

[0024] Effects of the Invention

[0025] Proper external transfer of the ejection fluid to the needle-free injector is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a diagram showing a schematic structure of a needle-free syringe driven by gunpowder.

[0027] Figure 2A It shows the composition Figure 1 FIG. 1 is a diagram showing a schematic structure of a first subassembly of a device assembly configured in a needle-free syringe.

[0028] Figure 2B It shows the composition Figure 1A diagram showing a schematic structure of a second subassembly of the device assembly disposed in the syringe shown.

[0029] Figure 3 It is used for Figure 2A The first subassembly shown is a three-dimensional view of an adapter for transferring injection liquid injected from a needle-free syringe.

[0030] Figure 4 yes Figure 3 A cross-sectional view of the adapter is shown.

[0031] Figure 5 FIG. 1 is a first diagram showing a state where the adapter is mounted on the first subassembly.

[0032] Figure 6 This is a flowchart showing the flow of a method for transferring an injection liquid using an adapter.

[0033] Figure 7 FIG. 2 is a second diagram showing a state where the adapter is mounted on the first subassembly.

[0034] Explanation of symbols

[0035] 1: Syringe (needle-free syringe)

[0036] 2: Syringe housing

[0037] 3: Injection

[0038] 4: Plunger

[0039] 5: Piston

[0040] 10: Device assembly

[0041] 10A: Subassembly

[0042] 10B: Subassembly

[0043] 30: barrel

[0044] 31: Nozzle

[0045] 31a: Ejection port

[0046] 31b: Injection nozzle

[0047] 31c: Front face

[0048] 32: Containment

[0049] 44: Rod

[0050] 90: Adapter

[0051] 91: Upper peripheral wall

[0052] 92: Filling nozzle

[0053] 92a: Open end

[0054] 92b: protrusion

[0055] 93: Cylindrical part

[0056] 93a: Inner wall surface

[0057] 94: Hat brim

[0058] 95: Lower peripheral wall

[0059] 95a: Inner wall surface

[0060] 96: Holding device

[0061] 96a: Component 1

[0062] 96b: Component 2

[0063] 99: Shell

[0064] 99a: Containment

[0065] R1: Part of the area DETAILED DESCRIPTION

[0066] Hereinafter, an adapter 90 for transferring an injection liquid to a needle-free syringe (hereinafter, referred to as a "syringe") 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings. The syringe 1 is a needle-free syringe that uses the combustion energy of gunpowder to inject an injection liquid corresponding to the injection target substance of the present application into a target area, that is, a device that injects the injection liquid into a target area without using an injection needle. Before describing the details of the adapter 90, the syringe 1 will be described.

[0067] It should be noted that the configuration of the following embodiment is an example, and the present invention is not limited to the configuration of the embodiment. In the present embodiment, "front end side" and "base end side" are used as terms to indicate the relative positional relationship in the longitudinal direction of the syringe 1. The "front end side" is close to the front end of the syringe 1 described later, that is, it indicates a position close to the injection port 31a, and the "base end side" indicates the direction opposite to the "front end side" in the longitudinal direction of the syringe 1, that is, it indicates the direction of the drive unit 7 side. In addition, in the adapter 90, the downstream side, that is, the downstream side of the flow when the injection liquid is transferred Figure 4 The bottom side shown is regarded as the "front end side", and the opposite side is Figure 4 The upper side shown is regarded as the "base end side".

[0068] <Structure of syringe 1>

[0069] here, Figure 11 is a diagram showing a schematic structure of the syringe 1 and is also a cross-sectional view along the longitudinal direction of the syringe 1. The syringe 1 is formed by attaching a device assembly 10 to a syringe housing 2. The device assembly 10 is a subassembly composed of an injection unit 3 and a plunger 4 (see hereinafter). Figure 2A ) 10A and a subassembly consisting of a syringe body 6, a piston 5 and a drive unit 7 (see later described) Figure 2B ) 10B are assembled into one. It should be noted that in the following description of the present application, the injection liquid injected into the target area by the syringe 1 is formed by making the liquid medium contain a given substance that is expected to exert an effect and function in the target area. In the injection liquid, the given substance may be dissolved in the liquid as the medium, or may be in a state of being undissolved and only mixed.

[0070] As the given substance contained in the ejection liquid, for example, a substance of biological origin that can be ejected to the target area as a living body, a substance that exerts a desired physiological activity, for example, as a substance of biological origin, DNA, RNA, nucleic acid, antibody, cell, etc. can be listed, as a substance that exerts physiological activity, low molecular weight pharmaceuticals, inorganic substances such as metal particles used for thermal therapy and radiotherapy, and substances with various pharmacological / therapeutic effects containing a carrier as a carrier, etc. can be listed. In addition, as a liquid that becomes a medium of the ejection liquid, as long as it is a substance suitable for applying these given substances to the target area, it has nothing to do with the situation of water-based or oily. In addition, as long as the given substance can be ejected with the syringe 1, the viscosity of the liquid as a medium is not particularly limited.

[0071] The device assembly 10 is configured to be detachable from the syringe housing 2. The receiving portion 32 (see FIG. 1 ) formed between the injection portion 3 and the plunger 4 included in the device assembly 10 is Figure 2A), the syringe 1 is filled with injection liquid in the preparation stage before operation, and the device assembly 10 is a unit to be replaced each time the injection liquid is injected. On the other hand, the syringe housing 2 side includes a battery 9, and the battery 9 supplies power to the igniter 71 included in the drive unit 7 of the device assembly 10. By the user pressing the button 8 provided on the syringe housing 2, power can be supplied from the battery 9 between the electrode on the syringe housing 2 side and the electrode on the drive unit 7 side of the device assembly 10 through wiring. It should be noted that the shape and position of the electrode on the syringe housing 2 side and the electrode on the drive unit 7 side of the device assembly 10 are designed in such a way that the two electrodes are automatically in contact when the device assembly 10 is mounted on the syringe housing 2. In addition, the syringe housing 2 is a unit that can be reused as long as the battery 9 has power that can be supplied to the drive unit 7. Among them, in the syringe housing 2, when the battery 9 is out of power, only the battery 9 can be replaced and the syringe housing 2 can be used continuously.

[0072] Here, based on Figure 2A and Figure 2B The configuration of the subassemblies 10A and 10B, and the detailed configuration of the injection unit 3, plunger 4, piston 5, syringe body 6, and drive unit 7 included in the two subassemblies are described. The injection unit 3 has a nozzle unit 31 including a housing unit 32, and the plunger 4 is arranged in the subassembly 10A so as to be slidable in the housing unit 32, which is a space capable of housing the injection liquid. The outer periphery of the front end side of the nozzle unit 31 is formed in a columnar shape.

[0073] The barrel 30 of the injection part 3 can be made of, for example, known nylon 6-12, polyarylate, polybutylene terephthalate, polyphenylene sulfide, or liquid crystal polymer. In addition, these resins may contain fillers such as glass fiber and glass filler. In the case of polybutylene terephthalate, 20 to 80% by mass of glass fiber may be contained, in the case of polyphenylene sulfide, 20 to 80% by mass of glass fiber may be contained, and in the case of liquid crystal polymer, 20 to 80% by mass of mineral may be contained.

[0074] In addition, the receiving portion 32 formed inside the barrel 30 is arranged so that the plunger 4 can slide toward the nozzle portion 31 (the front end side direction), and the space formed between the plunger 4 and the barrel of the injection portion 3 becomes a space in which the injection liquid 320 is sealed. Figure 3The adapter 90 described in the above description is transferred to the housing portion 32, and the details will be described later. Here, by sliding the plunger 4 in the housing portion 32, the injection liquid 320 accommodated in the housing portion 32 is pressed and passes through the injection nozzle 31b provided on the front end side of the nozzle portion 31, and is ejected through the injection port 31a. The injection port 31a opens at the end face (front end face) 31c on the front end side of the nozzle portion 31. It should be noted that the front end face 31c is basically a plane except for the injection port 31a.

[0075] The plunger 4 slides smoothly in the receiving portion 32, and is formed of a material that does not cause the injection liquid 320 to leak from the side of the plunger 4. As a specific material of the plunger 4, for example, butyl rubber and silicone rubber can be used. Further examples include: styrene elastomers, hydrogenated styrene elastomers, materials obtained by mixing polyethylene, polypropylene, polybutene, α-olefin copolymers and other polyolefins, liquid paraffin, process oils and other oils, talc, cast rubber, mica and other powdered inorganic substances in the elastomer. Polyvinyl chloride elastomers, olefin elastomers, polyester elastomers, polyamide elastomers, polyurethane elastomers, natural rubber, isoprene rubber, chloroprene rubber, nitrile rubber, styrene-butadiene rubber and various rubber materials (especially vulcanized rubber), their mixtures, etc. can also be used as the material of the plunger 4. In addition, in order to ensure / adjust the sliding property between the plunger 4 and the injection portion 3, various substances can also be used to coat / surface process the surface of the plunger 4 and the surface of the receiving portion 32 of the injection portion 3. As the coating agent, PTFE (polytetrafluoroethylene), silicone oil, diamond-like carbon, nanodiamond, etc. can be used.

[0076] Here, if Figure 2A As shown, the plunger 4 has a head 41 and a trunk 42, which can be connected by a neck 43 having a diameter smaller than that of the head 41 and the trunk 42. The diameter of the neck 43 is reduced in this way to form a storage space for an O-ring that can serve as a sealing member. It should be noted that the contour of the front end side of the head 41 is formed into a shape that is substantially consistent with the contour of the inner wall surface of the nozzle portion 31. As a result, when the injection liquid is ejected, the plunger 4 slides toward the nozzle portion 31 side, and when it reaches the innermost position located at the innermost side in the receiving portion 32, the gap formed between the plunger 4 and the inner wall surface of the nozzle portion 31 can be minimized, thereby preventing the injection liquid 320 from remaining in the receiving portion 32 and causing waste. Among them, the shape of the plunger 4 is not limited to a specific shape as long as the desired effect can be obtained in the syringe of this embodiment.

[0077] In addition, the plunger 4 is provided with a rod 44 extending from the end surface of the base end side of the trunk 42 in the direction of the base end side. The rod 44 has a diameter sufficiently smaller than that of the trunk 42, but has a diameter such that the user can grasp the rod 44 and move it in the receiving section 32. When the user transfers the injection liquid to the receiving section 32, the user grasps the rod 44 and moves the plunger 4, thereby sucking the injection liquid into the receiving section 32 from the outside. In addition, when the plunger 4 is located at the innermost position of the receiving section 32 of the injection section 3, the rod 44 protrudes from the end surface of the base end side of the injection section 3, and the user can grasp the rod 44. The length of the rod 44 is determined so that the rod 44 can be grasped by the user.

[0078] Here, we return to the description of the injection section 3. The inner diameter of the injection nozzle 31b of the nozzle section 31 provided on the injection section 3 side is formed in a manner that is thinner than the inner diameter of the housing section 32. With such a configuration, the injection liquid 320 pressurized to a high pressure can be ejected to the outside from the ejection port 31a of the injection nozzle 31b. In addition, a threaded portion 33a for coupling the syringe body 6 on the subassembly 10B side described later to the injection section 3 is formed in the neck 33 located on the base end side of the injection section 3. The diameter of the neck 33 is set to be smaller than the diameter of the barrel 30.

[0079] Next, based on Figure 2B The subassembly 10B including the piston 5, the syringe body 6, and the driving unit 7 is described. The piston 5 is constructed so as to slide in the through hole 64 formed inside the barrel 60 of the syringe body 6 by being pressurized by the combustion product generated by the igniter 71 of the driving unit 7. Here, in the syringe body 6, a joint recess 61 is formed on the front end side with the through hole 64 as a reference. The joint recess 61 is a portion that is engaged with the neck 33 of the injection unit 3 described above, and a threaded portion 62a that is threadedly connected to the threaded portion 33a provided on the neck 33 is formed on the side wall surface 62 of the joint recess 61. In addition, the through hole 64 and the joint recess 61 are connected together by the connecting portion 63, and the diameter of the connecting portion 63 is set to be smaller than the diameter of the through hole 64. In addition, in the syringe body 6, a driving unit recess 65 is formed on the base end side with the through hole 64 as a reference. The driving unit 7 is arranged in the driving unit recess 65.

[0080] In addition, the piston 5 is made of metal and has a first body 51 and a second body 52. ​​The piston 5 is arranged in the through hole 64 in such a manner that the first body 51 faces the engaging recess 61 side and the second body 52 faces the driving portion recess 65 side. The first body 51 and the second body 52 are opposite to the inner wall surface of the through hole 64 of the syringe body 6, and the piston 5 slides in the through hole 64. It should be noted that the first body 51 and the second body 52 are connected to each other through a connecting portion thinner than the diameter of each body, and an O-ring or the like is arranged in the space between the two bodies formed thereby in order to improve the closeness with the inner wall surface of the through hole 64. In addition, the piston 5 can also be made of resin, in which case, a portion requiring heat resistance and pressure resistance can be combined with metal.

[0081] Here, a pressing column portion 53 is provided on the end face on the front end side of the first trunk portion 51, and the pressing column portion 53 has a diameter smaller than the first trunk portion 51 and smaller than the diameter of the connecting portion 63 of the syringe body 6. The pressing column portion 53 is provided with a receiving hole 54 at an opening on the end face on the front end side thereof, and the diameter of the receiving hole 54 is greater than the diameter of the rod portion 44 and the depth thereof is deeper than the length of the rod portion 44. Therefore, when the piston 5 is pressurized by the combustion products of the igniter 71, the pressing column portion 53 can transfer its combustion energy to the end face on the base end side of the trunk portion 42 of the plunger 4 via the end face on the front end side thereof. It should be noted that the shape of the piston 5 is not limited to Figure 2B The shape recorded in.

[0082] Next, the drive unit 7 is described. The barrel 72 of the drive unit 7 is formed in a cylindrical shape, has an igniter 71 inside, and is arranged in the drive unit recess 65 as described above in a manner that the combustion energy generated by the igniter 71 can be transmitted to the second body 52 of the piston 5. The igniter 71 is an electrical igniter that burns ignition powder to generate energy for injection. Specifically, the barrel 72 of the drive unit 7 can also be formed by fixing the injection-molded resin to a metal ferrule. Regarding this injection molding, a known method can be used. The resin material of the barrel 72 of the drive unit 7 is formed by the same resin material as the barrel 30 of the injection unit 3.

[0083] Here, the combustion energy of the ignition powder used in the igniter 71 is the energy used by the injector 1 to eject the injection liquid to the target area. It should be noted that as the ignition powder, preferably, there can be listed: a gunpowder containing zirconium and potassium perchlorate (ZPP), a gunpowder containing titanium hydride and potassium perchlorate (THPP), a gunpowder containing titanium and potassium perchlorate (TiPP), a gunpowder containing aluminum and potassium perchlorate (APP), a gunpowder containing aluminum and bismuth oxide (ABO), a gunpowder containing aluminum and molybdenum oxide (AMO), a gunpowder containing aluminum and copper oxide (ACO), a gunpowder containing aluminum and iron oxide (AFO), or a gunpowder consisting of a combination of multiple of these gunpowders. These gunpowders will generate high-temperature and high-pressure plasma when they burn just after ignition, but when the combustion products condense at room temperature, they show the characteristic of a sharp drop in pressure because they do not contain gas components. As long as the appropriate injection of the injection liquid can be achieved, gunpowders other than these can also be used as ignition powder.

[0084] In addition, in the syringe 1, in order to adjust the pressure change applied to the injection liquid via the piston 5, in addition to the above-mentioned ignition powder, a gas generating agent 80 is also arranged. The gas generating agent 80 burns and generates gas using the combustion product generated by the combustion of the gunpowder in the igniter 71. The arrangement position can be as follows Figure 1 , Figure 2B As shown, it is a part that can be exposed to the combustion products from the igniter 71. In addition, as another method, the gas generator 80 can be arranged in the igniter 71 as disclosed in International Publication Gazette No. 01-031282, Japanese Patent Gazette No. 2003-25950, etc. As an example of a gas generator, a single-base smokeless gunpowder containing 98% by mass of nitrocellulose, 0.8% by mass of diphenylamine, and 1.2% by mass of potassium sulfate can be cited. In addition, various gas generators used in gas generators for air bags and gas generators for seat belt pretensioners can also be used. By adjusting the size, size, shape, and especially the surface shape of the gas generator when it is arranged in the through hole 64, the combustion end time of the gas generator can be changed, thereby adjusting the change in the pressure applied to the injection liquid, so that its injection pressure reaches the desired change.

[0085] It should be noted that the injection liquid 320 can be transferred to the subassembly 10A using Figure 3 Therefore, in the state where the transfer of the injection liquid 320 is completed in the subassembly 10A, for example, Figure 2A As shown, the plunger 4 is pulled out until the end surface of the base end side of the body portion 42 of the plunger 4 reaches a position slightly protruding from the end surface of the base end side of the injection portion 3 .

[0086] In addition, in the subassembly 10B, first, from Figure 2BThe piston 5 is inserted into the base end side of the syringe body 6 shown. At this time, the piston 5 is inserted into the through hole 64 in such a manner that the pressing column 53 faces the side of the engaging recess 61. Furthermore, the end face on the front end side of the piston 5, that is, the end face on the front end side of the pressing column 53 where the receiving hole 54 opens, is positioned in a state where it protrudes a given amount from the bottom surface of the engaging recess 61 (the surface orthogonal to the side wall surface 62). For the positioning of the piston 5, known techniques can be appropriately utilized, such as using a positioning fixture with a mark set in the through hole 64 for positioning. Then, the gas generating agent 80 is arranged in the through hole 64, and the drive unit 7 is installed in the drive unit recess 65. It should be noted that the fixing force of the piston 5 in the through hole 64 is such that the piston 5 can slide sufficiently smoothly in the through hole 64 by utilizing the pressure applied by the combustion products generated by the igniter 71 of the drive unit 7, and is such that when the subassembly 10A is installed in the subassembly 10B, the piston 5 is able to resist the force received from the plunger 4 without causing the position of the piston 5 to change.

[0087] The subassembly 10A thus constructed is mounted on the subassembly 10B by the threaded connection of the threaded portions 33a and 62a, thereby forming the device assembly 10. At this time, as the two are combined, the rod portion 44 of the plunger 4 enters and is accommodated in the receiving hole 54 provided in the pressing column portion 53 of the piston 5, and finally reaches a state where the end surface of the front end side of the pressing column portion 53 contacts the end surface of the base end side of the body portion 42 of the plunger 4. It should be noted that since the receiving hole 54 has a size sufficient to accommodate the rod portion 44, in this contact state, the inner wall surface of the inner side of the receiving hole 54 (especially the bottom surface of the receiving hole 54) will not contact the end of the base end side of the rod portion 44, so the rod portion 44 will not be subjected to a load from the piston 5 side. Furthermore, when the piston 5 continues to move forward until the final threaded connection position is reached, as described above, the position of the piston 5 is fixed to the through hole 64 under the action of sufficient friction force, and therefore, the plunger 4 is positioned in the injection part 3 by pressing the column 53 and moving the plunger 4 to the injection port 31a side. It should be noted that a portion of the injection liquid 320 corresponding to the ejection amount of the plunger 4 is ejected from the injection port 31a.

[0088] When the plunger 4 is positioned at the final position in this way, the formation of the device assembly 10 is completed. In the device assembly 10, the piston 5 is positioned at a predetermined position relative to the syringe body 6, and the position of the plunger 4 in the receiving portion 32 of the injection portion 3 is mechanically finalized with the piston 5 as a reference. The final position of the plunger 4 is a position uniquely determined in the device assembly 10, so the amount of the injection liquid 320 finally received in the receiving portion 32 can be used as a predetermined predetermined amount.

[0089] Furthermore, the device assembly 10 is mounted on the syringe housing 2, and when the user presses the button 8 with the ejection port 31a in contact with the target area, the ejection liquid 320 is pressurized via the piston 5 and the plunger 4, and ejection is performed, so that the ejection liquid 320 is injected into the target area.

[0090] <Transfer of Injection Liquid to Receiving Section 32>

[0091] As described above, before operating the syringe 1, the user needs to assemble the subassembly 10A and the subassembly 10B. In particular, when assembling the subassembly 10A, the user needs to transfer the injection liquid from the outside to the initially empty storage portion 32. In this embodiment, the injection liquid is transferred using Figure 3 The adapter 90 shown. Hereinafter, the transfer of the injection liquid using the adapter 90 will be described in detail.

[0092] First, based on Figure 3 to Figure 5 The structure of the adapter 90 will be described. Figure 3 is a perspective view of the adapter 90, Figure 4 is a cross-sectional view of the adapter 90. In addition, Figure 5 1 is a diagram showing a state in which the adapter 90 is used. When the adapter 90 is used to transfer the injection liquid to the subassembly 10A of the syringe 1 , the adapter 90 is mounted on the subassembly 10A.

[0093] The adapter 90 has a shell 99 forming its main body. The shell 99 is formed by a given resin material that has been injection molded. Regarding this injection molding, a well-known method can be used. For example, the resin material of the adapter 90 is the same resin material as the barrel 30 of the injection part 3, for example, well-known nylon 6-12, polyarylate, polybutylene terephthalate, polyphenylene sulfide or liquid crystal polymer can be used. It should be noted that, as described later, in order to give appropriate flexibility to the protrusion 92b included in the adapter 90, compared with the barrel 30 of the injection part 3, a material with lower hardness can be selected based on a given parameter (for example, Vickers hardness) related to the hardness of the resin material. In addition, the material of the protrusion 92b can be different from the material of the shell 99, for example, the material of the shell 99 can be made of polypropylene, while the material of the protrusion 92b can be made of silicone rubber.

[0094] The housing 99 has: Figure 4 In the state shown, the upper peripheral wall portion 91 is located above, the cap edge portion 94 is connected to the upper peripheral wall portion 91, and the lower peripheral wall portion 95 is connected to the cap edge portion 94 in a manner located below the cap edge portion 94. Figure 3As shown, the upper circumferential wall portion 91, the brim portion 94, and the lower circumferential wall portion 95 are portions that can be visually identified from the outside of the adapter 90. Among them, the upper circumferential wall portion 91 has a generally cylindrical shape connected to the brim portion 94 in a tapered state as the upper circumferential wall portion 91 approaches the central axis L1 of the adapter 90 as it moves upward from the brim portion 94. Therefore, a given space 99a is defined inside the housing 99 by the upper circumferential wall portion 91. The given space 99a functions as a receiving portion 99a for receiving the injection liquid. The receiving portion 99a is connected to the filling nozzle 92 at its lower portion as described later, and the receiving portion 99a is formed in a manner such that the inner diameter of a portion of the area R1 below the receiving portion 99a including the connection portion thereof decreases from the upper side to the lower side (filling nozzle 92 side).

[0095] In addition, a filling nozzle 92 is provided inside the upper peripheral wall portion 91, which is located below the receiving portion 99a and communicated with the receiving portion 99a. The filling nozzle 92 has a protrusion formed by causing a part of the inner wall surface of the upper peripheral wall portion 91 to protrude in an annular shape toward the front end side of the adapter 90 in a manner that narrows the internal space. Therefore, the uppermost end (base end) of the filling nozzle 92 is communicated with the receiving portion 99a, and the inner diameter of the filling nozzle 92 at the uppermost end is consistent with the inner diameter of the lowermost end of the connected receiving portion 99a. On the other hand, an opening end 92a is formed at the lowermost end (front end) of the filling nozzle 92, that is, the front end of the protrusion, and the inner diameter of the opening end 92a is set to be smaller than the inner diameter of the receiving portion 99a, especially smaller than the inner diameter of the lowermost end of the receiving portion 99a, which has the smallest inner diameter. In addition, the filling nozzle 92 is formed in a manner that its inner diameter decreases from its uppermost end toward the opening end 92a, which is the lowermost end. In this way, a flow path is formed in the internal space of the filling nozzle 92 , through which the injection liquid contained in the containing portion 99 a flows, and the injection liquid can pass through the opening end 92 a and move further downward in the housing 99 .

[0096] In addition, a cylindrical portion 93 is provided which extends downward from the middle of the outer periphery of the filling nozzle 92. The inner wall surface 93a of the cylindrical portion 93 is substantially parallel to the central axis L1 of the adapter 90. The cylindrical portion 93 corresponds to the first cylindrical portion. The inner diameter of the internal space defined by the inner wall surface 93a is equal to the inner diameter of the front end portion (at the end of the barrel 30 of the injection portion 3) of the injection portion 3. Figure 2AThe outer diameter of the columnar nozzle portion 31 (the portion located on the far left in the state shown) corresponds to, and is preferably substantially identical to, the outer diameter of the columnar nozzle portion 31. Furthermore, in the filling nozzle 92, the portion from the position where the cylindrical portion 93 is provided to the front end of the filling nozzle 92 is defined as a protrusion 92b. The protrusion 92b is formed in a state of protruding in an annular shape toward the internal space of the cylindrical portion 93, and the opening end 92a of the filling nozzle 92 is defined by the end edge on the front end side of the protrusion 92b. The length of the protrusion 92b (or the height in the direction of the center axis L1) is sufficient to accommodate the opening end 92a in the internal space of the cylindrical portion 93, in other words, to ensure that the cylindrical portion 93 is in a state of fully extending downward from the front end of the protrusion 92b.

[0097] Next, the cap brim 94 is connected to the lowermost end of the upper peripheral wall 91, and Figure 4 The lower peripheral wall portion 95 is a cylindrical member arranged orthogonally to the cap edge portion 94, and its inner wall surface 95a is substantially parallel to the central axis L1 of the adapter 90. The lower peripheral wall portion 95 corresponds to the second cylindrical portion. The inner diameter of the internal space defined by the inner wall surface 95a is equal to the middle part (at the center of the barrel 30 of the injection portion 3) of the injection portion 3. Figure 2A In the state shown, the portion between the front end portion where the nozzle portion 31 is located and the base end portion provided with the threaded portion 33a corresponds to the outer diameter of the thickest portion in the barrel 30, and is preferably substantially consistent. Therefore, the inner diameter of the inner space formed by the inner wall surface 95a is greater than the inner diameter of the inner space formed by the inner wall surface 93a mentioned above. In addition, the inner space formed by the inner wall surface 95a is communicated with the inner space formed by the upper peripheral wall portion 91 in the shell 99. However, the cylindrical portion 93 does not reach the inner space formed by the inner wall surface 95a.

[0098] The adapter 90 thus constructed is used to transfer the ejected liquid. Figure 5 As shown, the adapter 90 is mounted relative to the subassembly 10A in a manner such that the adapter 90 is located above the subassembly 10A. Figure 5 The installation state is described. When installing the adapter 90, it is preferably configured in a manner that the ejection port 31a of the subassembly 10A faces upward (vertical direction). It should be noted that the ejection port 31a does not necessarily have to face upward, but since the rod 44 is operated in a state where the ejection liquid is contained in the receiving portion 99a when the ejection liquid is transferred as described later, in order to prevent the ejection liquid from spilling, it is preferred that the ejection port 31a faces upward as much as possible. In addition, after the adapter 90 has just been installed in the subassembly 10A, in consideration of the subsequent operation of the rod 44, the head 41 of the plunger 4 is in contact with the innermost end face of the receiving portion 32.

[0099] With respect to such a subassembly 10A, the front end portion of the barrel 30 is inserted into the internal space of the lower peripheral wall portion 95 of the adapter 90, forming a state in which the inner wall surface 95a of the lower peripheral wall portion 95 is engaged with the middle portion of the barrel 30, and the inner wall surface 93a of the cylindrical portion 93 is engaged with the columnar front end portion of the barrel 30. Furthermore, while maintaining such an engaged state, the subassembly 10A is inserted relative to the adapter 90 until the front end portion of the protrusion 92b touches the front end surface 31c of the nozzle portion 31. It should be noted that Figure 5 The illustrated mounting state shows a state in which the front end portion of the protrusion 92 b abuts against the front end surface 31 c of the nozzle portion 31 .

[0100] In this installed state, the ejection port 31a of the nozzle portion 31 and the opening end 92a of the filling nozzle 92 are in a state of being overlapped. Therefore, a state is formed in which the ejection liquid contained in the containing portion 99a can flow into the nozzle portion 31 side of the subassembly 10A through the opening end 92a and the ejection port 31a. It should be noted that in this state, since the opening end 92a is larger than the ejection port 31a, the annular protrusion 92b is in annular contact with the front end face 31c in a manner of surrounding the ejection port 31a without blocking it. Furthermore, as described above, since the housing 99 including the protrusion 92b is formed of a resin material that can exert appropriate flexibility, when the protrusion 92b touches the front end face 31c due to the user's operation when installing the adapter 90, the protrusion 92b is appropriately bent, and a good contact state can be formed between the protrusion 92b and the front end face 31c. Thereby, a good seal is produced between the protrusion 92b and the front end surface 31c, and when the injection liquid is injected into the receiving portion 99a, wasteful leakage of the injection liquid can be suppressed.

[0101] In this way, Figure 5 In the mounted state shown, the protrusion 92b is in annular contact with the front end surface 31c, and the adapter 90 is stably supported by the tubular portion 93 and the lower peripheral wall portion 95 relative to the subassembly 10A. Therefore, safe transfer of the injection liquid can be achieved.

[0102] The actual transfer of the ejection fluid is based on Figure 6 First, the adapter 90 is prepared (processing of S101). At this time, the head 41 of the plunger 4 is in contact with the end surface located at the innermost side of the receiving portion 32 in the subassembly 10A as described above. Next, the adapter 90 is mounted on the subassembly 10A constituting the syringe 1 as described above to form a syringe 1. Figure 5 Then, in the state where the receiving portion 99a is located at the top ( Figure 5In the state shown in the figure), the injection liquid to be transferred is injected into the receiving portion 99a from the open end of the receiving portion 99a.

[0103] When the injection of the injection liquid into the receiving portion 99a is completed, the receiving portion 99a is kept in an upper position in a manner that does not allow the injection liquid to spill, and the user pulls the rod portion 44 downward. Through the movement of the rod portion 44, the injection liquid in the receiving portion 99a flows into the injection nozzle 31b through the injection port 31a and reaches the receiving portion 32, thereby being transferred. Here, in the adapter 90, a partial area R1 of the receiving portion 99a and the entire space inside the filling nozzle 92 are focused on. These spaces (areas) are continuous spaces from a partial area R1 to the opening end 92a in the interior of the adapter 90, and the space is equivalent to a given space. Therefore, the continuous space is constructed in a manner in which its inner diameter decreases from the upper side of the adapter 90 toward the opening end 92a.

[0104] With such a structure, in the internal space of the adapter 90, its inner wall surface is continuously inclined relative to the central axis L1, and the internal space gradually becomes narrower. When the suction force generated by the rod portion 44 being pulled downward acts on the injection liquid, due to the existence of such a continuous inclined surface, the injection liquid is not easy to disperse in the filling nozzle 92 and is easy to be concentrated relative to the injection port 31a. In particular, when the amount of injection liquid to be transferred is small, the influence of the resistance received from the inner wall surface of the filling nozzle 92 increases, and it is difficult for the above-mentioned suction force to act effectively on the injection liquid. However, by forming a concentrated structure of the injection liquid formed by such a continuous inclined surface (for example, a funnel-shaped structure), the injection liquid can be effectively transferred, and during the transfer, the transfer can be achieved while suppressing the degree of mixing of the surrounding air and the injection liquid. It should be noted that it is more preferable to form the above-mentioned continuous inclined surface in the entire space within the filling nozzle 92 as described above. As long as mixing of the injected liquid and the air is not easy to occur, a part of the internal space of the filling nozzle 92 may also include a space defined by an inner wall surface other than the above-mentioned continuous inclined surface (for example, an inner wall surface parallel to the center axis L1).

[0105] In addition, as described above, since the opening end 92a is larger than the injection port 31a, when the rod 44 is pulled downward, the injection liquid tends to flow relatively smoothly in the filling nozzle 92. Furthermore, the annular protrusion 92b contacts the front end surface 31c with high sealing performance, so that the suction force generated by the movement of the rod 44 can be effectively generated. From this point of view, the injection liquid can also be appropriately transferred.

[0106] When the transfer of the injection liquid is completed by the operation of the rod 44, the adapter 90 is removed from the subassembly 10A, and the Figure 2AThe injection liquid is shown in a state filled in the housing portion 32. Then, by combining the subassembly 10A and the subassembly 10B and attaching them to the syringe case 2, the syringe 1 can be prepared in a usable state.

[0107] <Variation 1>

[0108] In the above embodiment, when the adapter 90 is installed, the inner wall surface 93a of the cylindrical portion 93 is formed to fit with the outer peripheral wall surface of the columnar nozzle portion 31, so that the adapter is installed in a stable state with respect to the subassembly 10A. In this modified example, the outer peripheral wall surface of the nozzle portion 31 is further formed into a tapered surface inclined along its axial direction (for example, at Figure 2A In the state shown, the tapered surface is formed in such a way that the outer diameter of the nozzle portion 31 becomes larger toward the right side of the figure (the base end side of the injection portion 3). By forming the tapered surface in this way, the subassembly 10A can be easily inserted into the adapter 90, and since the inner wall surface 93a and the tapered surface are pressed and fitted with each other, the bonding force in the installed state can be increased, and a more stable installed state can be formed.

[0109] <Variation 2>

[0110] For the adapter 90 of this modification, based on Figure 7 For explanation. Figure 7 In the adapter 90 shown, a retaining device 96 for retaining the mounted state of the adapter 90 and the subassembly 10A is provided. The retaining device 96 includes a first member 96a provided on the side of the adapter 90 and a second member 96b provided on the side of the subassembly 10A, and is a device for retaining the mounted state of the adapter 90 and the subassembly 10A by mechanically connecting the two members. As the retaining device 96, for example, a snap mechanism that can be engaged and disengaged can be cited. By adopting such a retaining device 96, the bonding force in the mounted state can be increased, and a more stable mounted state can be maintained.

Claims

1. An adapter for transferring a given injection liquid to an injection device through an injection port of an injection nozzle thereof, wherein the injection device is a device for injecting the given injection liquid from the injection nozzle, in, The adapter has: a housing defining a receiving portion for receiving the given injection liquid to be transferred and configured to be attachable to and detachable from the injection device; and a filling nozzle, which is arranged in the housing so as to communicate with the receiving portion and is formed so as to be able to contact the end surface of the injection device where the injection nozzle is formed with the injection outlet when the housing is mounted on the injection device, so as to make the given injection liquid received in the receiving portion flow out toward the injection nozzle side, and the opening end of the filling nozzle is set to be smaller than the inner diameter of the receiving portion and larger than the injection outlet of the injection nozzle, The filling nozzle has an annular protrusion protruding from the filling nozzle toward the front end side of the adapter, and the protrusion is formed in such a way that the front end of the protrusion abuts against the end surface of the injection device when the housing is mounted on the injection device. In the internal space of the housing from a partial area of ​​the housing to the opening end of the filling nozzle, at least a given space located inside the protrusion is formed in a manner such that the inner diameter of the given space decreases toward the opening end side of the filling nozzle.

2. The adapter according to claim 1, wherein: The given space is a space including the partial area and the entire internal space of the filling nozzle, The given space is formed such that the inner diameter of the given space continuously decreases toward the opening end of the filling nozzle from the partial region to the opening end of the filling nozzle.

3. The adapter according to claim 1, wherein: The protrusion is formed by a flexible member.

4. The adapter according to any one of claims 1 to 3, wherein: The injection device includes a columnar nozzle portion having the injection nozzle therein, and the nozzle portion is formed in such a manner that an injection port of the injection nozzle is exposed at an end surface thereof. The housing has a first cylindrical portion which is provided in the housing so as to surround the filling nozzle and is in a state of being fitted with an outer peripheral wall surface of the nozzle portion when the housing is attached to the injection device.

5. The adapter according to claim 4, wherein: The outer peripheral wall surface of the nozzle portion forms a tapered surface inclined along the axial direction of the nozzle portion, When the housing is mounted on the injection device, the inner wall surface of the first cylindrical portion is in the state of being fitted with the outer peripheral wall surface of the nozzle portion while pressing the inner wall surface of the first cylindrical portion.

6. The adapter according to claim 4, further comprising a holding portion, The holding portion holds a state in which the first cylindrical portion and the outer peripheral wall surface of the nozzle portion are fitted together when the housing is attached to the injection device.

7. The adapter according to claim 4, wherein: The housing has a second cylindrical portion which is provided in the housing so as to surround the first cylindrical portion and is fitted with an outer peripheral wall surface of the injection device when the housing is attached to the injection device.

8. A method for transferring an ejection liquid, the method comprising: Prepare an adapter, the adapter being an adapter for transferring a given injection liquid to an injection device via an injection port of its injection nozzle, the injection device being a device for injecting the given injection liquid from the injection nozzle, and the adapter comprising a housing and a filling nozzle, the housing defining a receiving portion for receiving the given injection liquid to be transferred, the filling nozzle being arranged in connection with the receiving portion in the housing, and having an opening end thereof being set to be smaller than an inner diameter of the receiving portion and larger than an injection port of the injection nozzle, the filling nozzle having an annular protrusion protruding from the filling nozzle toward the front end side of the adapter, and the protrusion being formed in such a manner that the front end of the protrusion abuts against the end face of the injection device when the housing is mounted on the injection device, and in the internal space of the housing from a portion of the receiving portion connected to the filling nozzle to the opening end of the filling nozzle, at least a given space located on the inner side of the protrusion is formed in such a manner that the inner diameter of the given space is reduced toward the opening end side of the filling nozzle, The housing is mounted relative to the injection device so that the front end of the filling nozzle contacts the end surface of the injection device where the injection port of the injection nozzle is formed. injecting the given injection liquid into the receiving portion, In a state where the adapter is located above the injection device in the vertical direction, the predetermined injection liquid is removed from the storage portion and transferred to the injection device.

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